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mmc: core: add random fault injection

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This adds support to inject data errors after a completed host transfer.
The mmc core will return error even though the host transfer is successful.
This simple fault injection proved to be very useful to test the
non-blocking error handling in the mmc_blk_issue_rw_rq().
Random faults can also test how the host driver handles pre_req()
and post_req() in case of errors.

Signed-off-by: Per Forlin <per.forlin@linaro.org>
Acked-by: Akinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Per Forlin 2011-08-19 14:52:37 +02:00 • committed by Chris Ball
parent df87ecbf19
commit 1b676f70c1
4 changed files with 82 additions and 0 deletions
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25
drivers/mmc/core/debugfs.c
View file

@ -12,6 +12,7 @@
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/fault-inject.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
@ -158,6 +159,23 @@ static int mmc_clock_opt_set(void *data, u64 val)
return 0;
}
#ifdef CONFIG_FAIL_MMC_REQUEST
static DECLARE_FAULT_ATTR(fail_mmc_request);
#ifdef KERNEL
/*
* Internal function. Pass the boot param fail_mmc_request to
* the setup fault injection attributes routine.
*/
static int __init setup_fail_mmc_request(char *str)
{
return setup_fault_attr(&fail_mmc_request, str);
}
__setup("fail_mmc_request=", setup_fail_mmc_request);
#endif /* KERNEL */
#endif /* CONFIG_FAIL_MMC_REQUEST */
DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
"%llu\n");
@ -187,6 +205,13 @@ void mmc_add_host_debugfs(struct mmc_host *host)
if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),
root, &host->clk_delay))
goto err_node;
#endif
#ifdef CONFIG_FAIL_MMC_REQUEST
host->fail_mmc_request = fail_mmc_request;
if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
root,
&host->fail_mmc_request)))
goto err_node;
#endif
return;